This is a good idea. Why don't us judges send our critiques to the contestants so if we have a bad opinion on them, it won't be that embarrassing, and it could work as if we are mentoring them in a way, and we can just send you our rate and our overall opinion. Does that make sense?
If not, here's an example.
Via PM/wall post: You weren't that good this week. You need to work on strengthening your voice, you sound so soft, and a good singer always projects their voice. If you want to stay in the competition, you're going to have to try to work on that. You might be a shy singer, but you have to get over that if you want to win. I can give you some good websites that help you get over that fear because you have a lot of potential!
Via the thread: 5. Work work work.
Idk, it might make the thread a little bit less entertaining, but it might save some hurt feelings. Just an opinion.